Battery pack



FIG. 1 is a front side perspective view from above of a battery pack showing our new design;

FIG. 2 is a rear side perspective view from above;

FIG. 3 is a side view;

FIG. 4 is a rear plan view;

FIG. 5 is a front plan view;

FIG. 6 is a top plan view; and,

FIG. 7 is a bottom plan view. 

The ornamental design for a "battery pack", as shown and described. 